Typographical slug casting machine



Jun 27, '1939.

0. A. ALBRECHT ET AL TYPOGRAPHICAL SLUG CASTING MACHINE Filed March 31, 1938 d m F Patented June 27, 1939 PATENT OFFICE TYPOGRAPHICAL SLUG CASTING MACHINE Christian Augustus Albrecht, Berlin, and Hermann Brandenburg,

Berlin-Tempelhof, Germany, assignors to Mergenthaler Linotype Company, Brooklyn, N. Y.,

. Application March 31,

a company of New York 1938, Serial No. 199,097

In Germany December 24, 1937 '7 Claims.

This invention relates to typographical slug casting machines. In such machines, it has already been proposed to cool the casting mould, .inorder not unduly to delay the operative cycles of the machine (more especially when casting thick slugs) it being necessary for the slug to be quite solid when ejected. It is particularly important that adequate cooling means should be employed in machines intended to deliver soi called finished slugs, since in such a case, no

machining of the slug takes place. In such machines the casting mould is provided with perfectly parallel walls and cannot be made with even a very slight taper, capable of facilitating ejection, if as inrtherknown arrangements.

' In some ,known means for cooling casting moulds, water flows through the mould disc and close to the casting moulds, and these arrangements suffer from the disadvantage that since they are not water tight, water comes out in drops and is liable to damage the machine.

For this reason, attempts have been made to cool the casting mould by means of air, and in some known means, a current of air is directed through the casting slot in order to cool it. This arrangement however, is not practicable because the cooling of the casting slot is in itself not sufficient, and further, this method can only be effective so long as no slugs are cast. It is precisely at the critical time, i. e., when the injected metal is actually in the casting mould and requires cooling, that no air is able to pass through the mould slot.

It has also previously been proposed to drill holes in the casting mould itself, transversely of the mould slot, and to force air through the said holes when the mould is in the ejecting position. The air is thus blown in to the atmosphere and this gives rise to the disadvantage that the lead dust produced on the casting mould may be driven into the casting cavity, while the noise of the driven air also disturbs the operator.

The invention aims at overcoming the disadvantages of the arrangements heretofore proposed while at the same time combines their advantages, and to this end contemplates the use of cooling means applied during the time the slug is cast and ejected.

With this end in view the invention consists in a typographical slug casting machine comprising ducts or channels, for air cooling, running longitudinally of the mould and stationary hoods with which the ends of the channels are in register and by which the channels are closed when the mould is at rest, cooling air being supplied to and removed from the ducts or channels by means connected to said hoods.

The supply and the removal of the cooling air is preferably automatically regulated]. v

The invention will be understood from the following description of one form, given by way of example, which it may assume, and this description will be more readily followed by reference to the accompanying drawing, wherein:-- m

Figure 1 is a front elevation of part of the mould carrier with cooling arrangements according to the present invention;

Figure 2 is a section taken along the line 2-2 of Figure 1; and

Figure 3 is a section taken'along-the line 3- of Figural.

In carrying the invention into effect in one convenient manner as shown in the accompanying drawing, a mould carrier a is provided onwhich are mounted the moulds b in recesses of the carrier, being securely held in position by screws 0. A hole e is drilled through the mould, and in the lower face of the mould isprovided a recess which is closed by the abutting surface of the mould on the mould carrier, so that there are two channels passing through the mould and terminating in the angularly shaped chambers g of the mould carrier. These angularly shaped chambers are alsoprovided with inlet or outlet passages, open towards the external surface of the mould'carrier. Where the inlet or outlet openings of the chambers g are located in the position of the casting mould when temporarily at rest, they are provided with a closing hood h. To one of these hoods, preferably that arranged in the ejecting position over the mould located in the operative position, is attached the inlet pipe 1', each of the remaining hoods having an outlet pipe 70. Such an outlet pipe should be present at the lower end of the mould which happens to be in the ejecting position, and may if required also at the left hand end of the mould which is in casting position. There is no need to provide a hood over the fourth opening which may more simply be fitted with an ordinary air-tight closing cover adapted to slide over the periphery of the mould carrier.

The mode of operation of the means described above is such that during the temporary resting position of the mould, cooling air passes through the pipe i and the hood it into the angularlyshaped chamber g located in front of the said hood. From this point the air travels through the holes of the moulds located in the casting position and in the ejecting position, and escapes at the other ends of the said moulds, so that appropriate cooling takes place. A throttling or closing organ such as a tap or a valve may be arranged in the supply pipe and kept closed by the mould disc or the mould disc driving mechanism so long as the mould disc is rotated, but opened as soon as the mould disc comes to a resting position. The throttling or closing organ may also be controlled by the driving mechanism of the machine so as to be released immediately before the casting operation and ensure that thereafter the cooling air passes through the mould, until the said organ is again closed after ejection.

It shoud be understood that the invention is not limited solely to the detailsfof construction of the form described above, since various modifications may be introduced as they become desirable in order to carry the invention into effect under different conditions and requirements which have to be fulfilled, without departing in any way from the scope of the invention.

Having described our invention we declare that what we claim and desire to secure by Letters Patent is:--

1. A typographical slug casting machine com,- prising a mould mounted on a mould wheel, which is movable to carry said mould between the slug casting and ejecting positions, longitudinal channels through said mould and open at both ends, relatively stationary hoods with which the opposite open ends of said channels register and by which they are closed, when the mould is stationary, and means connected to said hoods for passing a current of cooling air through said channels. I

2. A typographical slug casting machine comprising a plurality of moulds mounted on a mould wheel which is movable to carry the mould in use between its slug casting and ejecting positions, longitudinal channels through said moulds and open at both ends, chambers in said mould wheel with which said channels communicate through their open ends, each chamber being common to the adjacent end of channels in two adjacent moulds, and being open to atmosphere, relatively stationary hoods, with which said chambers respectively register and by which they are closed, when the mould wheel is stationary, and means connected to said hoods for passing a current of cooling air through said channels.

3. A typographical slug casting machine as claimed in claim, 2 comprising four moulds, wherein instead of a hood communicating with air supplying or removal means, there is employed, to register with the chamber common to the ends of the channels in the two moulds which are in neither the casting nor slug ejecting position, a cover plate which closes the chamber.

4. A typographical slug casting machine comprising a mould mounted on a mould wheel, which is movable to carry said mould between the slug casting and ejecting positions, a longitudinal imperforate channel extending through said mould and open at both ends, relatively station- 'ary hoods with which the opposite open ends of said channel register and by which it is closed when the mould is stationary, and means connected to saidhoodsfor passing a current of cooling air through said channel.

5. A typographical slug casting machine comprising a mould mounted on a mould wheel, which is movable to carry said mould between the slug casting and ejecting positions, a longitudinal imperforate channel extending through said mould and open at both ends, relatively stationary hoods with which the opposite open ends of said channel register and by which it is closed when the mould is in casting position, and means connected to said hoods for passing a current of cooling air through said channel.

6. A typographical slug casting machine comprising a mould mounted on a mould wheel, which is movable to carry said mould between the slug casting and ejecting positions, a longitudinal imperforate channel extending through said mould and open at both ends, relatively stationary hoods with which the opposite open ends of said channel register and by which it is closed when the mould is in ejecting position, and means connected to said hoods for passing a current of cooling air through said channel.

'7. A typographical slug casting machine comprising a plurality of moulds mounted on a mould wheel which is movable to carry the mould in use between the slug casting and ejecting positions, a longitudinal imperforate channel extending through each mould and open at both ends, chambersin said mould wheel with which said channels communicate, each chamber being common to the adjacent end of channels in two adjacent moulds and being open to the atmosphere, relatively stationary hoods with which said chambers respectively register and by which they are closed when the mould wheel is stationary, and means connected to said hoods for passing a current of cooling air through said channels.

CHRISTIAN AUGUSTUS ALBRECHT. HERMANN BRANDENBURG. 

